Which of the following describes allopatric speciation?
A) A population of squirrels is separated by the Grand Canyon. The two subpopulations evolve into two distinct species.
B) A tetraploid plant species evolves from a diploid ancestor. Both the tetraploid and diploid species are found in the same habitat.
C) One population breeds in the fall; another population breeds in the spring.
D) A male horse and a female donkey mate, producing a sterile hinny.
A
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If you were to compare the resting potential of a neuron to a battery, which way is the battery oriented?
A typical AA battery has a potential of 1.5V. One can think of the potential in a neuron as having similarities to that of a battery. A. positive terminal outside of the cell, and negative terminal inside B. positive terminal inside of the cell, and negative terminal outside C. positive terminal pointing toward the axon, negative terminal toward the dendrite D. positive terminal pointing toward the dendrite, negative terminal toward the axon E. both terminals inside the cell soma
Which of the following is one of the differences between mitosis and meiosis?
1.Sister chromatids are attached only in meiosis, not in mitosis. 2.Cells end up with two copies of each chromosome at the end of mitosis, but with four copies of each chromosome at the end of meiosis. 3.Homologous chromosomes are separated in meiosis, while only sister chromatids are separated in mitosis. 4.When meiosis is finished, chromosomes have only one sister chromatid, while at the end of mitosis, chromosomes have two sister chromatids.
Which of the following may show enzymatic
activity? I. lipids II. proteins III. RNA a. I only b. II only c. III only d. I and II e. II and III
The control over milk "let down," labor in childbirth, and water balance are mediated by the ____
gland. a. pineal b. anterior pituitary c. posterior pituitary d. parathyroid e. thyroid